package com.mzy.multithreading.lock.reentrantlock;

/**
 * Created with IntelliJ IDEA.
 *
 * @Author mzy
 * @Date 2022/8/8 6:22
 * @Version 1.0
 */

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 线程间定制化通信 - 案例实现
 */

// 第一步 创建资源类

class ShareResource {
    // 定义标志位
    private int flag = 1;    // 1. AA 2. BB 3 CC

    // 创建lock 锁
    private Lock lock = new ReentrantLock();

    // 创建三个condition
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();

    // 打印5次，参数第几轮
    public void print5(int loop) throws InterruptedException {
        // 上锁
        lock.lock();
        try {
            // 判断
            while (flag != 1) {
                // 等待
                c1.await();
            }
            // 干活
            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName() + " ::" + i + " :轮数 : " + loop);
            }
            // 通知BB
            flag = 2;
            c2.signal();
        } finally {
            // 释放锁
            lock.unlock();
        }
    }

    // 打印10次，参数第几轮
    public void print10(int loop) throws InterruptedException {
        lock.lock(); // 上锁
        try {
            // 判断
            while (flag != 2) {
                // 等待
                c2.await();
            }
            // 干活
            for (int i = 0; i < 10; i++) {
                System.out.println(Thread.currentThread().getName() + ":: " + i + " :轮数" + loop);
            }
            // 通知 CC线程
            flag = 3;
            c3.signal();
        } finally {
            lock.unlock();
        }
    }

    // 打印15次，参数第几轮
    public void print15(int loop) throws InterruptedException {
        lock.lock(); // 上锁
        try {
            // 判断
            while (flag != 3) {
                // 等待
                c3.await();
            }
            // 干活
            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName() + ":: " + i + " :轮数" + loop);
            }
            // 通知 CC线程
            flag = 1;
            c1.signal();
        } finally {
            lock.unlock();
        }
    }
}

public class ThreadDemo3 {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    shareResource.print5(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "AA").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    shareResource.print10(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "BB").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    shareResource.print15(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "CC").start();
    }
}
